Maxim Integrated DS3994Z

Description
The DS3994 is a 4-channel controller for cold-cathode fluorescent lamps (CCFLs) used in backlighting liquid crystal displays (LCDs) in TV and PC monitor applications. Its features make it suitable for large LCDs, while its low BOM cost makes it ideal for the entire range of LCD TVs and monitors.

Features
High-density CCFL controller for LCD TV and PC monitor backlights
Programmable staggered start for burst dimming on each channel
Strike frequency boost option
Programmable strike time
Can be easily cascaded with minimal external components
Analog brightness control
Gate driver phasing minimizes DC supply current surges
Per-channel lamp fault monitoring for lamp open, lamp overcurrent, failure to strike, and overvoltage conditions
Accurate (±2%) on-board oscillator lamp frequency (20kHz to 80kHz)
Wide range on-board DPWM burst-dimming oscillator (22.5Hz to 440Hz)
Can be synchronized to external sources for the lamp and DPWM frequencies
<10% to 100% dimming range
Soft-start minimizes audible transformer noise
I²C-compatible serial port and on-board nonvolatile (NV) memory allow device customization
3-byte NV user memory for storage of serial numbers and date codes
4.5V to 5.5V single-supply operation
-40°C to 85°C temperature range
28-pin SO (300 mils) package

Applications
LCD televisions
LCD PC monitors